com.xemantic.tadedon.gwt.activity.shared.ActivityChangeHandlingActivityMapper.java Source code

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Here is the source code for com.xemantic.tadedon.gwt.activity.shared.ActivityChangeHandlingActivityMapper.java

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/*
 * Copyright 2010 Xemantic
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.xemantic.tadedon.gwt.activity.shared;

import com.google.gwt.activity.shared.Activity;
import com.google.gwt.activity.shared.ActivityMapper;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.place.shared.Place;
import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.gwt.user.client.ui.IsWidget;

/**
 * 
 * <p>
 * Created on Nov 12, 2010
 *
 * @author hshsce
 */
public class ActivityChangeHandlingActivityMapper implements ActivityMapper {

    private final ActivityMapper m_activityMapper;

    private final EventBus m_eventBus;

    public ActivityChangeHandlingActivityMapper(ActivityMapper activityMapper, EventBus eventBus) {

        m_activityMapper = activityMapper;
        m_eventBus = eventBus;
    }

    /** {@inheritDoc} */
    @Override
    public Activity getActivity(Place place) {
        final Activity activity = m_activityMapper.getActivity(place);
        if (activity == null) {
            return null;
        }
        return new AbstractActivityWrapper(activity) {
            @Override
            public void start(final AcceptsOneWidget panel, EventBus eventBus) {
                activity.start(new AcceptsOneWidget() {
                    @Override
                    public void setWidget(IsWidget w) {
                        if (activity instanceof HasActivityDescription) {
                            m_eventBus.fireEvent(new ActivityChangeEvent(activity));
                        }
                        panel.setWidget(w);
                    }
                }, eventBus);
            }
        };
    }

}